If the frame size the patient wants is 'wrong' for their seg height, which measurements should you compare?

• A. Compare A measurements to each other or B measurements to each other
• B. Compare A measurements to B measurements
• C. Compare front width to temple length
• D. Compare lens height to frame height

Answer: (A)

When judging frame size, compare like measurements across options. Compare the horizontal eye-size (the width of each lens) to the same dimension in other frames, or compare the bridge width to the bridge width in other frames. These two measurements are what determine overall size and how the frame will sit on the face, so comparing A to A or B to B gives an apples-to-apples assessment.

Mixing different dimensions, like front width with temple length or lens height with frame height, doesn't reliably indicate fit because they measure different aspects of size. If seg height is off, you’ll want to check vertical factors (lens height, frame vertical dimension) separately, but for size comparison you stick to like measurements.